This magnificent gun was captured by the British after the siege of Alexandria during the Napoleonic Wars, in 1801, and has been here since it was transported to Horse Guards Parade in 1802.
The barrel was made by Murad, the Chief Gunner’s son, in 1524.
Better text here ...
https://theromantictraveller.blog/2012/07/05/turkish-gun-in-horse-guards-parade/
